I tried installing on my desktop I keep getting there are only ???(number here)/256 slides and 0 slides are valid when i boot from the usb drive my machine specs are:
Intel Core i7 7800x
Tuff x299 Mark 2 motherboard (asus)
32GB of DDR4 in quad channel
Amd Radeon Vega 64
I tried adding slide=x to the bootargs and that just leaves it stuck at a bunch of +++++'s I am using your image from the Catalina thread